CN1334468A - Full-reflection curved mirror - Google Patents

Abstract

A full-reflection curved mirror features that the porro prisms are closely arranged on the full-reflection curved surface in such manner that the inclined surfaces of all porro prisms are in a same plane. Its advantages are no need of reflecting film, high reflectivity and optical effect, and long service life.

Description

Full-reflection curved mirror

Technical field

The present invention relates to a kind of full-reflection curved mirror, be mainly used in sun power utilize in the device of sunshine reflection and optical convergence.

Background technology

Existing curved mirror is to adopt surface or back side plating reflected coat layer to realize light reflection and optical convergence, and its shortcoming is, coating firmness deficiency, and easily being corroded comes off, easy damaged coating when cleaning, serviceable life is short, and coating can't accomplish total reflection, and efficient is low.

Summary of the invention

Purpose of the present invention provides a kind of reflectivity height exactly, and the full-reflection curved mirror of long service life is to overcome the deficiencies in the prior art.

Technical scheme of the present invention is: its total reflection curved surface has compact arranged Porro prism to constitute, and this Porro prism inclined-plane all is in same plane.

Described Porro prism is that one deck is made by the glass of high index.

Described Porro prism is made up of the reflection horizon of one deck high index of refraction and the bearing bed of one deck low-refraction, and both have identical Porro prism face to overlap.

The refractive index of the reflection horizon of described high index of refraction and the bearing bed of low-refraction satisfies light is realized total reflection between reflection horizon and bearing bed condition.

The present invention proposes a kind of structure of full-reflection curved mirror, and the full-reflection curved mirror of similar structures can be released from this structure.

After adopting such scheme, used the total reflection characteristic of light in prism,, avoided the absorption of reflective membrane light not needing to plate the total reflection that realizes light under the situation of reflective membrane, thereby improve sub-reflection of light rate and light efficiency, thereby owing to do not have coating to improve the serviceable life of catoptron.

The invention will be further described below in conjunction with drawings and Examples.

Description of drawings

Fig. 1 is the structural representation of one embodiment of the invention.

Fig. 2 is the structural representation of another embodiment.

Fig. 3 is the synoptic diagram of the optically focused of the present invention in application.

Fig. 4 is the left view of Fig. 3.

The specific embodiment

Referring to Fig. 1, the structure of this embodiment is that the one side at optical glass has one deck close-packed arrays Porro prism 1 consist of, its right-angled edge 11 is towards an example, its inclined-plane 12 is all same flat Face, and as the plane of incidence of light. Can assemble for the light that makes reflection, make it that curved surface be arranged (parabola).

Referring to Fig. 2, described Porro prism 11 is made up of the reflecting layer 2 of one deck high index of refraction and the bearing bed 31 of one deck low-refraction, in the reflecting layer 2 of described high index of refraction compact arranged Porro prism 21 is arranged, the bearing bed 3 of low-refraction has the prism 31 identical with above-mentioned Porro prism 21, both closely overlap and consist of total Porro prism 1, and the refractive index n of reflecting layer 2 and bearing bed 3 will satisfy i_c＜45°，

Be sin^-1

Namely $\frac{n\′}{n}\≤0.7$ 。

Referring to Fig. 3, Fig. 4, the present invention utilizes sun tracker to make its sensitive surface when using Facing to the sun, incident sunray (A and B) is gathered thermal-arrest after total reflection of the present invention always Obtain on the pipe 4 utilizing. Incident ray (A and B) is in total reflection prism as can be seen from Figure 4 Through two secondary reflections, for the incidence angle that makes twice incident ray is close, preferably make first reflection The incidence angle of face 13 is 45 °, and the incidence angle of such second reflecting surface 14 also is 45 °. Will Produce total reflection under this incidence angle, just must select suitable n ' (Refractive Index of Glass Prism) and n (air refraction is 1) makes critical angle less than 45 °. According to $\frac{n\′}{n}\≤0.7$ Can calculate full The n value of the above-mentioned condition of foot should be greater than 1.4, and generally the n value of glass satisfies this all greater than 1.4 One condition.

Claims (4)

1, a kind of full-reflection curved mirror is characterized in that: its total reflection curved surface has compact arranged Porro prism to constitute, and this Porro prism inclined-plane all is in same plane.

2, full-reflection curved mirror according to claim 1 is characterized in that: described Porro prism is that one deck is made by the glass of high index.

3, full-reflection curved mirror according to claim 1 is characterized in that: described Porro prism is made up of the reflection horizon of one deck high index of refraction and the bearing bed of one deck low-refraction, and both have identical Porro prism face to overlap.

4, full-reflection curved mirror according to claim 3 is characterized in that: the refractive index of the reflection horizon of described high index of refraction and the bearing bed of low-refraction satisfies light is realized total reflection between reflection horizon and bearing bed condition.

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